From: Stephen Boyd <sboyd@kernel.org>
To: Iurii Zaikin <yzaikin@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>,
frowand.list@gmail.com, gregkh@linuxfoundation.org,
jpoimboe@redhat.com, keescook@google.com,
kieran.bingham@ideasonboard.com, mcgrof@kernel.org,
peterz@infradead.org, robh@kernel.org, shuah@kernel.org,
tytso@mit.edu, yamada.masahiro@socionext.com,
devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org,
kunit-dev@googlegroups.com, linux-doc@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-um@lists.infradead.org,
Alexander.Levin@microsoft.com, Tim.Bird@sony.com,
amir73il@gmail.com, dan.carpenter@oracle.com, daniel@ffwll.ch,
jdike@addtoit.com, joel@jms.id.au, julia.lawall@lip6.fr,
khilman@baylibre.com, knut.omang@oracle.com, logang@deltatee.com,
mpe@ellerman.id.au, pmladek@suse.com, rdunlap@infradead.org,
richard@nod.at, rientjes@google.com, rostedt@goodmis.org,
wfg@linux.intel.com
Subject: Re: [PATCH v4 17/18] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()
Date: Fri, 07 Jun 2019 12:00:47 -0700 [thread overview]
Message-ID: <20190607190047.C3E7A20868@mail.kernel.org> (raw)
In-Reply-To: <CAAXuY3p4qhKVsSpQ44_kQeGDMfg7OuFLgFyxhcFWS3yf-5A_7g@mail.gmail.com>
Quoting Iurii Zaikin (2019-06-05 18:29:42)
> On Fri, May 17, 2019 at 11:22 AM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-05-14 15:17:10)
> > > diff --git a/kernel/sysctl-test.c b/kernel/sysctl-test.c
> > > new file mode 100644
> > > index 0000000000000..fe0f2bae66085
> > > --- /dev/null
> > > +++ b/kernel/sysctl-test.c
> > > +
> > > +
> > > +static void sysctl_test_dointvec_happy_single_negative(struct kunit *test)
> > > +{
> > > + struct ctl_table table = {
> > > + .procname = "foo",
> > > + .data = &test_data.int_0001,
> > > + .maxlen = sizeof(int),
> > > + .mode = 0644,
> > > + .proc_handler = proc_dointvec,
> > > + .extra1 = &i_zero,
> > > + .extra2 = &i_one_hundred,
> > > + };
> > > + char input[] = "-9";
> > > + size_t len = sizeof(input) - 1;
> > > + loff_t pos = 0;
> > > +
> > > + table.data = kunit_kzalloc(test, sizeof(int), GFP_USER);
> > > + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 1, input, &len, &pos));
> > > + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
> > > + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, pos);
> > > + KUNIT_EXPECT_EQ(test, -9, *(int *)table.data);
> >
> > Is the casting necessary? Or can the macro do a type coercion of the
> > second parameter based on the first type?
> Data field is defined as void* so I believe casting is necessary to
> dereference it as a pointer to an array of ints. I don't think the
> macro should do any type coercion that == operator wouldn't do.
> I did change the cast to make it more clear that it's a pointer to an
> array of ints being dereferenced.
Ok, I still wonder if we should make KUNIT_EXPECT_EQ check the types on
both sides and cause a build warning/error if the types aren't the same.
This would be similar to our min/max macros that complain about
mismatched types in the comparisons. Then if a test developer needs to
convert one type or the other they could do so with a
KUNIT_EXPECT_EQ_T() macro that lists the types to coerce both sides to
explicitly.
next prev parent reply other threads:[~2019-06-07 19:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 22:16 [PATCH v4 00/18] kunit: introduce KUnit, the Linux kernel unit testing framework Brendan Higgins
2019-05-14 22:16 ` [PATCH v4 01/18] kunit: test: add KUnit test runner core Brendan Higgins
2019-05-17 0:35 ` Stephen Boyd
2019-05-17 18:53 ` Stephen Boyd
2019-06-14 23:22 ` Brendan Higgins
2019-05-14 22:16 ` [PATCH v4 02/18] kunit: test: add test resource management API Brendan Higgins
2019-05-17 0:38 ` Stephen Boyd
2019-06-04 23:34 ` Brendan Higgins
2019-05-14 22:16 ` [PATCH v4 03/18] kunit: test: add string_stream a std::stream like string builder Brendan Higgins
2019-05-17 17:42 ` Stephen Boyd
2019-06-05 0:19 ` Brendan Higgins
2019-05-14 22:16 ` [PATCH v4 04/18] kunit: test: add kunit_stream a std::stream like logger Brendan Higgins
2019-05-17 17:58 ` Stephen Boyd
2019-06-05 0:47 ` Brendan Higgins
2019-05-14 22:16 ` [PATCH v4 05/18] kunit: test: add the concept of expectations Brendan Higgins
2019-05-14 22:16 ` [PATCH v4 06/18] kbuild: enable building KUnit Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 07/18] kunit: test: add initial tests Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 08/18] objtool: add kunit_try_catch_throw to the noreturn list Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 09/18] kunit: test: add support for test abort Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 10/18] kunit: test: add tests for kunit " Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 11/18] kunit: test: add the concept of assertions Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 12/18] kunit: test: add tests for KUnit managed resources Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 13/18] kunit: tool: add Python wrappers for running KUnit tests Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 14/18] kunit: defconfig: add defconfigs for building " Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 15/18] Documentation: kunit: add documentation for KUnit Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 16/18] MAINTAINERS: add entry for KUnit the unit testing framework Brendan Higgins
2019-05-14 23:25 ` Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 17/18] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec() Brendan Higgins
2019-05-17 18:22 ` Stephen Boyd
2019-06-06 1:29 ` Iurii Zaikin
2019-06-07 19:00 ` Stephen Boyd [this message]
2019-06-07 22:22 ` Brendan Higgins
2019-06-11 17:58 ` Brendan Higgins
2019-06-11 18:50 ` Stephen Boyd
2019-06-11 20:29 ` Brendan Higgins
2019-05-14 22:17 ` [PATCH v4 18/18] MAINTAINERS: add proc sysctl KUnit test to PROC SYSCTL section Brendan Higgins
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